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CHAPTER 7. ANALYTIC GEOMETRY
â
qÜÉ=Öê~ÇáÉåí=çÑ=íÜÉ=äáåÉ=áë= = í~å α K=
=
=
=
Figure 99.
=
625. dê~ÇáÉåí=çÑ=~=iáåÉ==
ó − ó
â = í~å α = O N =
ñ − ñ N
O
=
=
=
Figure 100.
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